advance auto should have them, as should carquest.
Out here in New Mexico, particularly Albuquerque, the only place to carry them was CarQuest. O'Reilly's/Checkers, Autozone, and Napa don't carry them. I originally ordered from rockauto since I was (im)patiently waiting on my fox shocks to arrive. Unfortuantely I tore one of the boots on one of my new lower bjs. The awesome part was the CarQuest was a little cheaper than rockauto, plus no shipping charge or wait.